- Correspondence to Dr Jose M. Martínez Sánchez, Biostatistics Unit, Department of Basic Sciences, Universitat Internacional de Catalunya, Carrer de Josep Trueta s/n, Sant Cugat del Vallès 08195, Barcelona;
- Received April 11, 2016
- Revised August 1, 2016
- Accepted August 24, 2016
- First published September 13, 2016.
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